THE PRESERVATION OF MILK ' 65 
Experiments on Animals 
The only recorded experiments are those of Rideal and Foulerton on 3 Cats, i Rabbit, 
and 2 Guinea-pigs. The Cats, which were 3 months old, and the Guinea-pigs, which were over 
200 grammes in weight, were not in such a condition as to furnish the best indication of the action 
of formalin. No effect was noticed after a course extending over some weeks. I therefore 
arranged a large number of experiments on young kittens, 3 or 4 weeks old, kept under conditions 
similar to those in the experiments with boric acid. The results are noted in the following tables. 
A. — Kittens Receiving Formaldehyde i Part in 50,000 of Milk 
No. 
Original 
Weight at end of 
weight. 
First 
week. 
Second 
week. 
Thir.l 
week. 
Fourth 
week. 
Fifth 
«-eek. 
Sixth 
week. 
Seventh 
week. 
Grms. 
Grms. 
Grms. 
Grms. 
Grms. 
Grms. 
Grms. 
Grms. 
I 
271 
3"5 
336 
399 
* 
2 
279 
275 
285 
326 
370 
434 
463 
3 
+65 
++7 
409 
4 
425 
420 
++5 
+ 38 
410 
537 
646 
590 
5 
315 
303 
290 
367 
331 
Control Kittens Receiving Untreated Milk 
No. 
Original 
Weight at end of 
weight. 
First 
week. 
Second 
week. 
Third 
week. 
Fointh 
week. 
Fifth 
week. 
Sixth 
week. 
Grms. 
Grms. 
Grms. 
Grms. 
Grms. 
Grms. 
Grms. 
6 
315 
320 
333 
340 
384 
441 
7 
425 
486 
450 
583 
680 
744 
836 
8 
430 
380 
358 
445 
547 
609 
9 
432 
473 
478 
538 
672 
731 
B.— Kn 
TENS Receiving Formaldehyde i Part in 25,000 of Milk 
No. 
Original 
Weight 
at end of 
weight. 
First 
week. 
Second 
week. 
Third 
week. 
Fourth 
week. 
Fifth 
week. 
Sixth 
week. 
Grms. 
Grms. 
Grms. 
Grms. 
Grms. 
Grms. 
Grms. 
408 
4.6 
518 
510 
537 
558 
583 
2 
405 
485 
568 
567 
612 
630 
585 
3 
539 
565 
717 
692 
706 
700 
713 
4 
537 
575 
695 
727 
764 
760 
793 
* Dead. 
*I 
