218 Tests with Precipitins 



The order of the antisera at the top of the page will serve therefore as 

 an index to the order of the series of bloods tested. The columns 

 giving the reactions have been grouped in blocks in their order of 

 classification, so as to facilitate a comprehension of the reactions taking 

 place, for instance amongst the Ungulata, as an order. As long as 

 Mammalian bloods are under consideration, the anti-mammalian sera 

 are thus grouped ; the order to which the antiserum belongs being 

 given at the foot of the page. When we come to the test upon avian 

 bloods on the other hand, all columns referring to the tests with anti- 

 mammalian sera are included in one " block." 



By reading from left to right the reactions given by any one blood 

 with the different antisera will be gathered, whereas if the columns are 

 read from top to bottom, the reactions given by each antiserum with 

 the different bloods in succession will be gathered. 



The reactions which took place between each antiserum and each 

 blood are included in the space formed by the intersection of the lines 

 which include the name of the animal whose blood was tested (on the 

 left), and those which include the name of the antiserum (above). The 

 degrees of reaction are indicated by the following signs : 



+ denotes great reaction 

 + ,, marked clouding 

 x ,, medium clouding 

 * ,, faint clouding 



denotes 110 reaction 



/ blood insoluble 



s blood gave clouded solution 



The time when the reaction was noted is stated below the above 

 signs in minutes, anywhere from 1 to 240 (4 hrs.). In a number of my 

 earlier tests, the observations were not extended beyond 30 minutes, 

 and the deposits taking place after 16 24 hours were not studied. 

 This was not the case however in most of the tests. The amounts of 

 deposit noted on the following day are indicated by the letters beneath 

 the sign for the early or immediate reaction, noted above, as also 

 beneath the number of minutes, as follows : 



D denotes very large deposit 



D moderate deposit 



d small deposit 



tr trace of deposit 



c cloudiness persisting after 16 24 hrs. 



In the earlier tests where a reading of these deposits was omitted, 

 their significance not being appreciated at the time, the probable 



