43G GEORGE H. P. NUTTALL. 



upon the results of the investigations conducted bj the 

 German Malaria Commission, consisting of himself, R. 

 Pfeiffer, and H. Kossel. Further details will be found 

 in a publication which appeared September 8th, 1899. 

 The Commission observed the development of Pro- 

 teosoma in Culex nemorosus, from the formation of 

 the 'Wermiculi" described by MacCallum for Halter i- 

 dium to their appearance- in the salivary gland of the 

 insect. The process of fertilisation was found to occur 

 in Proteosoma, as MacCallum had found for Halteri- 

 dium and human crescentic parasites. Healthy birds 

 were successfully infected by means of infected insects. 

 The later publication, which is illustrated by excellent 

 microphotographs, completel}^ confirms the observations 

 of Ross and others. 



February 5th, 1899^ Grassi, Bignami, and Bastianelli 

 observe the development of quartan parasites in 

 A. claviger. Ross (September 2nd, 1899) observed 

 the development of quartan parasites in a species of 

 Anopheles in Sierra Leone. 



January 23rd, 1899, Daniels reported to the Royal Society 

 that he had been able to confirm Ross's observations 

 with Proteosoma. He followed their development in 

 a species of Culex, and successfull}^ infected healthy 

 birds by means of infected insects. He added nothing 

 to what Ross had already found. 



April 19th, 1899,Bastianelli and Bignami reported further 

 studies upon the development of tertian parasites in 

 Anopheles claviger, and describe three successful 

 infection experiments on man by means of A. claviger 

 previously fed on tertian parasites. 



May 7tli, 1899, Grassi, Bignami, and Bastianelli report 

 to the Accademia dei Lincei that they had observed the 

 development of tertian and crescentic parasites in 

 Anopheles bifurcatus. 



June 18th, 1899, Grassi observed the development of 

 tertian and crescentic parasites in Anopheles 



