186 . The American Naturalist. [March, 



Results : Again, there is no marked evidence that species 

 are common among different animals, but there is strong evi- 

 dence of constancy of appearance of certain types when once 

 present. This, perhaps, is to be expected, for it is hardly pos- 

 sible that in an ordinary milking all individuals could be 

 excluded from the milk cistern and lower teat passages. 



The following table and annotations may help to show the 

 bearings of the work : 



Teats = No. 1 



No. 2 



No. 3 



No. 4 



I-.x ( .r 



r. No. 1, July 2nd. Nos. 1 

 No. 2, July 3rd. 6 

 No. 3, July 4th. 16 



No. 4, July 6th. (Not taken) 

 No. 5, July 8th. (Lost Cul.) 

 No. 6, July 10th. 30, 1 

 No. lo, July 17th .J.V53. J 

 No. 13, July 23rd. 96, H3. 94 

 No. 15, July 28th. 1 77, 67 



Nos. 1 



1 



1 

 17 and 1 



(LosO 



1 

 (Not taken) 



Nos. 1 

 9 and 10 



20 

 10, 61 



96,97 



66, 100 & 67 



Nos. 5 



5, 100 & 77 



(Not taken) 



26,27,15,29 



- 

 67,1 



Annotation No. 1, a solid curd, lactic acid forming micro- 

 coccus, is seen to be present upon every date, appearing in teat 

 No. 2 upon all possible dates save one. 



Nos. 5, 10, 15, 61 and 67 occurred twice each, the intervening 

 days being respectively 2, 8, 7, 4 and 4. It is worthy of note 

 that with the exception of No. 67, each of these was found each 



Cow No. 21 





Species present 



per teat, by dates. 



r^ = 



No. 1 





No. 2 



No. 3 



No. 4 



Expr. No- 8, July 12th. 

 Expr. No. 9, July, 15th. 

 Expr. No. 12, July 16th. 



Nos. 45 

 (Lost) 

 53, 51, & 



56 



Nos. 31 

 31, 50 



31, 45 



Nos. 27, 31 

 29, 53 



1 (Not taken) 



Nos. 20 



(Lost) 



