346 Annals Entomolgoical Society of America [Vol. VIII, 
2.5 litres or 0.56 gr. will dissolve 1 litre). But we may say 
that perhaps by further search mammalian blood corpuscles. 
may be found, which are more sensitive to the poison of the 
plant-louse I have used than the blood of the ox. 
Another point also deserves emphasis. Although a hemoly- 
tic poison is found in the organism of the plant-louse, we are 
unable at present to name the part of the body in which it 
occurs. This is also true of the haemolytic experiments which 
have been performed on the house-spider, since in this case 
also the whole spider was triturated. The case of the hemolytic 
experiments on the poison of honey bees, however, is different, 
since the sting together with the poison sac was extracted, 
and operations were therefore carried out on the poison organ 
alone.* 
*Conf. J. Morgenroth u. U. Carpi, Ueber ein Toxolecithid des Bienengiftes~ 
Berl. Klinisch. Wochenschrift. Jahrg. 43, 1906, pp. 1424-1425. 
