222 
PROCEEDINaS OF SOCIETIES, 
donated twelve beautiful slides, mounted with the following objects, 
viz. : Scales of Lepisma saccJiarina, wolffia, columbiana, fertile frond 
of maidenhair fern, fertile frond of Lygodium palmatum, coccinella, 
spinnerets of garden spider, American podura, culex (male and 
female), head and tongue of horse-fly, gizzard of cockroach for 
polariscope, and ovipositor of saw-fly. 
Mr. W. G. W. Hartford donated seven slides, mounted with 
Mhahdomena arcuatum (Scotland), Aulacodiscus scaher, Gyrosigma 
Spencerii (New York), guano (Gulf of California), diatoms from San 
Francisco, transverse section of Indian corn, and wool from the Cape 
of Good Hope. 
Mr. H. G. Hanks donated a slide mounted by him with a section 
of magnesian rock from Healdsburgh, and a number of seeds of 
Paparium somnifera from Turkey, the peculiar marking of the latter 
being interesting and making a beautiful opaque object. 
Mr. C. G. Ewing donated a slide mounted by him with the palate 
of a land mollusc (Arion). 
Mr. C. Mason Kinne donated four slides mounted by him with 
Tingis hyalina, obtained by Mr. Edwards from Calaveras county, 
California, and which proved to be a most beautiful object, the entire 
upper portion of the insect being covered with a curiously woven 
network of glassy appearance; the very remarkable egg of a Cali- 
fornia butterfly, Polyommattus xantJioides, and the cell structure of 
the pith of elder. The fourth slide was mounted with what was 
claimed to be worms taken from diseased teeth; and in presenting 
this slide Mr. Kinne read a short paper, which explained the matter 
fulLy. 
Mr. Henry Edwards donated twelve additional specimens of the 
Tingis hyalina taken from the flowers of the coeonothis, mammoth 
trees, Calaveras county, California ; two specimens of parasite from 
the chrysalis of a species of brassolis, Panama ; and a gordius, class 
entozoa, from Colusa, California, which was accompanied by a paper 
giving a technical description of the characteristics of the genus ; and 
if, as suggested by Mr. Edwards, this be a new variety, a careful 
study of its habits, life history, and microscopic examination, would 
furnish the material for a very valuable paper. 
Dr. Harkness, who has just returned from a short trip to the 
Sandwich Islands, exhibited several slides representing different 
phases in the life history of the blight which is believed to have 
been the cause of disease in the coffee plant of those islands. 
The Doctor was unable to obtain, at the time of his visit, any 
coffee leaves which were afflicted by the fungus, but brought with him 
several leaves of the guava plant, which were infested with a blight, 
said to be identical with that found on the coffee tree. These speci- 
mens belong to the genus Hyphomycetes, which appears upon the 
upper surface of the leaf as a black mould, and is a true fungus, the 
mycelium forming a network over the surface of the article, and its 
filaments dipping downward into the cell beneath. From the surface 
of the mycelium aerial hyphae are thrown oft* in branches, made up of 
globose cells, .adhering to each other, sometimes rising in a single 
