diff --git a/docs/source/pythonapi/examples/mgxs-part-i.ipynb b/docs/source/pythonapi/examples/mgxs-part-i.ipynb
index 7b20a97db..e7b8cc73a 100644
--- a/docs/source/pythonapi/examples/mgxs-part-i.ipynb
+++ b/docs/source/pythonapi/examples/mgxs-part-i.ipynb
@@ -433,7 +433,7 @@
        "              \tName           =\t\n",
        "              \tFilters        =\t\n",
        "                              \t\tmesh\t[10000]\n",
-       "                              \t\tenergy\t[0.000000E+00 6.250000E-07 2.000000E+01]\n",
+       "                              \t\tenergy\t[  0.00000000e+00   6.25000000e-07   2.00000000e+01]\n",
        "              \tNuclides       =\ttotal \n",
        "              \tScores         =\t['flux']\n",
        "              \tEstimator      =\ttracklength), ('absorption', Tally\n",
@@ -441,7 +441,7 @@
        "              \tName           =\t\n",
        "              \tFilters        =\t\n",
        "                              \t\tmesh\t[10000]\n",
-       "                              \t\tenergy\t[0.000000E+00 6.250000E-07 2.000000E+01]\n",
+       "                              \t\tenergy\t[  0.00000000e+00   6.25000000e-07   2.00000000e+01]\n",
        "              \tNuclides       =\ttotal \n",
        "              \tScores         =\t['absorption']\n",
        "              \tEstimator      =\ttracklength)])"
@@ -520,9 +520,10 @@
       "\n",
       "      Copyright:      2011-2016 Massachusetts Institute of Technology\n",
       "      License:        http://openmc.readthedocs.io/en/latest/license.html\n",
-      "      Version:        0.7.1\n",
-      "      Git SHA1:       3d68c07625e33cd64188df03ee03e9c31b3d4b74\n",
-      "      Date/Time:      2016-07-22 21:03:18\n",
+      "      Version:        0.8.0\n",
+      "      Git SHA1:       16e74656b028875a7ebcb90df07293c5f1cc56a4\n",
+      "      Date/Time:      2016-07-29 13:20:18\n",
+      "      MPI Processes:  1\n",
       "\n",
       " ===========================================================================\n",
       " ========================>     INITIALIZATION     <=========================\n",
@@ -532,11 +533,11 @@
       " Reading geometry XML file...\n",
       " Reading cross sections XML file...\n",
       " Reading materials XML file...\n",
-      " Reading H1.71c from /home/romano/openmc/data/nndc_hdf5/H1_71c.h5\n",
-      " Reading O16.71c from /home/romano/openmc/data/nndc_hdf5/O16_71c.h5\n",
-      " Reading U235.71c from /home/romano/openmc/data/nndc_hdf5/U235_71c.h5\n",
-      " Reading U238.71c from /home/romano/openmc/data/nndc_hdf5/U238_71c.h5\n",
-      " Reading Zr90.71c from /home/romano/openmc/data/nndc_hdf5/Zr90_71c.h5\n",
+      " Reading H1.71c from /Users/sam/git/openmc-sam/data/nndc_hdf5/H1_71c.h5\n",
+      " Reading O16.71c from /Users/sam/git/openmc-sam/data/nndc_hdf5/O16_71c.h5\n",
+      " Reading U235.71c from /Users/sam/git/openmc-sam/data/nndc_hdf5/U235_71c.h5\n",
+      " Reading U238.71c from /Users/sam/git/openmc-sam/data/nndc_hdf5/U238_71c.h5\n",
+      " Reading Zr90.71c from /Users/sam/git/openmc-sam/data/nndc_hdf5/Zr90_71c.h5\n",
       " Maximum neutron transport energy: 20.0000 MeV for H1.71c\n",
       " Reading tallies XML file...\n",
       " Building neighboring cells lists for each surface...\n",
@@ -607,20 +608,20 @@
       "\n",
       " =======================>     TIMING STATISTICS     <=======================\n",
       "\n",
-      " Total time for initialization     =  3.2300E-01 seconds\n",
-      "   Reading cross sections          =  1.6900E-01 seconds\n",
-      " Total time in simulation          =  1.9882E+01 seconds\n",
-      "   Time in transport only          =  1.9869E+01 seconds\n",
-      "   Time in inactive batches        =  2.6590E+00 seconds\n",
-      "   Time in active batches          =  1.7223E+01 seconds\n",
-      "   Time synchronizing fission bank =  4.0000E-03 seconds\n",
-      "     Sampling source sites         =  4.0000E-03 seconds\n",
-      "     SEND/RECV source sites        =  0.0000E+00 seconds\n",
+      " Total time for initialization     =  3.8300E-01 seconds\n",
+      "   Reading cross sections          =  2.0900E-01 seconds\n",
+      " Total time in simulation          =  2.3245E+01 seconds\n",
+      "   Time in transport only          =  2.3223E+01 seconds\n",
+      "   Time in inactive batches        =  2.0320E+00 seconds\n",
+      "   Time in active batches          =  2.1213E+01 seconds\n",
+      "   Time synchronizing fission bank =  1.0000E-02 seconds\n",
+      "     Sampling source sites         =  7.0000E-03 seconds\n",
+      "     SEND/RECV source sites        =  2.0000E-03 seconds\n",
       "   Time accumulating tallies       =  0.0000E+00 seconds\n",
-      " Total time for finalization       =  0.0000E+00 seconds\n",
-      " Total time elapsed                =  2.0217E+01 seconds\n",
-      " Calculation Rate (inactive)       =  9402.03 neutrons/second\n",
-      " Calculation Rate (active)         =  5806.19 neutrons/second\n",
+      " Total time for finalization       =  1.0000E-03 seconds\n",
+      " Total time elapsed                =  2.3642E+01 seconds\n",
+      " Calculation Rate (inactive)       =  12303.1 neutrons/second\n",
+      " Calculation Rate (active)         =  4714.09 neutrons/second\n",
       "\n",
       " ============================>     RESULTS     <============================\n",
       "\n",
diff --git a/openmc/mgxs/mgxs.py b/openmc/mgxs/mgxs.py
index 539904744..1ef3194be 100644
--- a/openmc/mgxs/mgxs.py
+++ b/openmc/mgxs/mgxs.py
@@ -773,6 +773,13 @@ class MGXS(object):
         cv.check_value('value', value, ['mean', 'std_dev', 'rel_err'])
         cv.check_value('xs_type', xs_type, ['macro', 'micro'])
 
+        # FIXME: Unable to get microscopic xs for mesh domain because the mesh
+        # cells do not know the nuclide densities in each mesh cell.
+        if self.domain_type == 'mesh' and xs_type == 'micro':
+            msg = 'Unable to get micro xs for mesh domain since the mesh ' \
+                  'cells do not know the nuclide densities in each mesh cell.'
+            raise ValueError(msg)
+
         filters = []
         filter_bins = []