OLFACTORY BULBS OF THE ALBINO RAT 2AT 
TABLE 4 
Giving number of mitral cells in one olfactory bulb of the albino rat 
Arranged by litters 
PERCENTAGE 
WEIGHT NUMBER 
AGE RAT lee | GoRDAD, GEINC DIFFERENCE OF REMARKS 
TEST 
days grams 
62 | Fi Test 0.020) 71,527 (S.) |+ 0.08 
62 | F; Control | 0.032] 71,468 (S.) 
115 '| O; Test 0.029] 71,663 (S.) |— 0.9 
115 | O, Control | 0.041] 72,333 (S.) 
62 | M, Test 0.025] 76,611 (C.) |+ 0.2 
62 | M; Control] 0.037| 76,596 (C.) 
59 | Cs Test 0.022| 79,165 (S.) |— 0.9 ee 
59 | C; Test 0.024) 70,625 (S.) |—12.0 
62 | C7 Control | 0.036} 79,839 (S.) 
30 | X, 30d. T.| 0.017] 71,914 (C.) Very incomplete 
134 | X.-R.C.T. | 0.040] 80,114 (C.) Slightly incomplete (not 
in average) 
61 | G3; Test 0.027| 83,974 (S.) |+ 2.9 
61 | Gs Control | 0.031] 81,638 (C.) 
30 | Qs 30d. C. 0.024] 82,192 (C.) Probably 300 more cells 
Average per cent difference of test....]|— 1.8 
(S.) = Sagittal section. 
-(C.) = Cross section. 
count for every fifth section of this region. The computation then 
gave a total of 83,974. Two other bulbs of this litter were also cut 
in sagittal sections and an attempt was made to count the mitral cells 
but the bulbs were so irregular that it would have been necessary to 
count practically every section, so these counts were abandoned. 
Bulb O;, Test, defective diet series. One hundred and fifteen days. 
Sagittal section. Counts made as in FE). 
Bulb Gs, control, defective diet series. Sixty-one days. Cross 
section. Counts made as in &}. 
Bulb F;, control, defective diet series. Sixty-one days. Cross 
section. Counts made as in FE}. 
Bulb C;, control, defective diet series. Sixty-two days. Sagittal 
sections. Counts as in F}. 
Bulb Ms, control, defective diet series. Sixty-two days. Cross 
sections. Counts as in M, and computation of all cell elements in 
gray layer made for entire series. 
Bulb X., test, revolving-cage series. One hundred and thirty-four 
days. Cross sections. Mitral cells counted by both methods de- 
scribed for X;. Also all cell elements of the gray layer computed for 
the entire series as in My, and Ms. 
Bulb O,, control, defective diet series. One hundred and fifteen 
days. Sagittal section. Mitral cells counted as in Ej. 
