NERVOUS SYSTEM 



51 



TABLE 35— Concluded. 



SOLUTIONS U8ED FOB 

 FIXATION 



Lang's fluid 



Lang's fluid 



Marina's fluid 



Marina's fluid. 



Cor. sublimate 



Cor. sublimate 



Sublimate-f ormol . . . 

 XaCl + sublimate.. 



Tellyesniczky 



Tellyesniczky 



XaCl + sublimate.. 

 Sublimate-formol . . 



Cox (osmic) 



Cox (osmic) 



Cox (formol-acetic) 

 Cox (formol-acetic) 



20 

 4 



72 

 96 



4 

 20 



4 

 4 



48 

 24 

 20 



20 

 4^ 

 72 

 48 

 72 



z a 



> 



Si 



siz 



^ z 



z E 



o = S 

 ? 



£ I * 



;S5 



> - - 



2.0670 

 2.0429 

 1.2219 

 1.2146 

 2.0760 

 2.0229 

 2.3315 

 1.9927 

 1.9643 

 1.7981 

 2.1549 

 2.0512 

 1.9917 

 2 . 1555 

 1.7687 

 1.8944 



z a 



+15 

 +10 

 -33 

 -35 



+ 8 

 +11 

 +21 

 + 7 

 + 6 

 + 3 

 +16 

 +17 

 + 2 

 +22 

 - 2 

 + 8 



2i5 



Z 3 O 



a a •< 



O &.*~ O 



& * 2oo 



5 5 2 5 

 s - - - 



1.6794 

 1.7970 

 1.2913 

 1.2546 

 1.4695 

 1.4087 

 1.6565 

 1.3947 

 1.6372 

 1.4906 

 1.5074 

 1.3687 

 1.5483 

 1.8365 

 1.5003 

 1.5221 



z 

 3 



3 H 



« z 



a 5 



- 7 



- 3 

 -29 

 -33 

 -23 

 -23 

 -14 

 -25 

 -12 

 -14 

 -19 

 -22 

 -12 

 + 4 

 -17 

 -13 



In a later study King ('13 a) followed in some detail the ef- 

 fects of formaldehyde on the brain of the Albino. The conclu- 

 sions reached were as follows: 



1. A 4 per cent solution of formaldehyde causes a pronounced swell- 

 ing in the brains of rats of all ages. 



2. A solution of formaldehyde undergoes some chemical change on 

 standing, since a solution five months old causes less swelling in the 

 brain of the rat than does a freshly made solution. 



3. A 4 per cent solution of formaldehyde neutralized with NaC0 3 

 produces a much greater amount of swelling in the brain of the rat 

 than does a solution that has a faintly acid reaction. 



4. A strong neutralized solution of formaldehyde causes a greater 

 percentage weight increase in the ratfe brain than does a weak neutral- 

 ized solution. A reverse result is obtained when the solutions are not 

 neutralized. 



