1884. Recent Literature. 517 
sometimes decimate the sheep-folds and poultry yards. A great 
number of fresh-water fishes die owing to the development of 
Myxosporidia in their tissues, a cause of destruction of these 
animals in our fish ponds which is still generally ignored. Fi- 
nally, says the author in the preface, the epidemic invasion of the 
Microsporidia in silk-raising establishments gave rise to the dis- 
ease called pebrine, which for twenty years has nearly ruined the 
silk industry throughout the world, and cost France alone more 
than a millard francs. 
correctly classifying them, but following Leuckart in regarding 
them as animal rather than vegetable. These organisms live as 
s 
Pig, Otaria, etc., and Balbiani believes that they begin by living 
on the surface of their host. 
ai vegetable. This view Balbiani combats with considerable 
sketch and at considerable length, fortifying his position with 
Ser = maintaining that they are animal and belong with the 
Rerort oF tHe GEOLOGICAL AND NATURAL HISTORY SURVEY 
Canadi ch bears date of 1883. With it comes a catalogue of 
ine ot” Part 1, Polypetale, by John Macoun, forming a 
currence 192 pages, and containing interesting notes on the oc- 
expected and distribution of the species. We should have 
than we E find more detailed notes on-the Labrador species 
; dep, git Northwest Terr., with special reference to the coal 
Moose > Ur. R. Bell reports on the geology of the basin of 
