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New Spencer 
Binocular 
Microscope 
No. 54 

POSSESSES MANY ADVANTAGES: 



I. Accommodates the greatest v^ariation in pupillary 
distances. 

II. Easily and quickly changed from one stand to the other. 

III. Will take a mechanical stage. 

IV. Black and white backgrounds beneath the stage are always out of the way* 

V. Has sufficient range of adjustment by rack and pinion to bring the objectives 
to a focus considerably above the plane of the stage, thus permitting the 
examination of objects of considerable thickness. 

VI. May be used on three other types of stands supplied by us (see new 1914 
catalog). 




Binocular Microscope No. 54 with one 

pair of objectives and one pair ^jri\ i\i\ 

of ocularsj complete in cabinet.. ^OU.UU 

DISCOUNT TO SCHOOLS 



We are headquarters for lAboratory apparatus of all kinds: Microscopes^ 
Microtomes, Projection Apparatus, Hemacytometers, Dissecting Instruments^ 
Hand Lenses, Incubators, Sterilizers, Glassware^ Chemicals, Stains, etc., etc. 



Ne%v Complete Catalog Just Ready 



SPENCER LENS COMPANY 

Buffalo. N.Y. 



CONTENTS 



PAGE 

Announcement 3 

The Destruction of the Vitality of Cysticercus Bovis by 

Freezing. B. H. Ransom 5 

Summary of Two Years' Study of Insects in Relation to 

Pellagra. Allan H. Jennings 10 

Variation in Oxyurias: Its Bearing on the Value of a 
Nematode Formula. Stanley B. Fracker 22 

Observations on the Eggs of Ascaris Lumbricoides. Win- 
THROP D. Foster 31 

Dr. Nott's Theory of Insect Causation of Disease. Wil- 
liam A. Riley 37 

Rhabditin: Contribution to a Science of Nematology. 
N. A. Cobb 40 

Experimental Ingestion by Man of Cysticerci of Carnivore 
Tapeworms. Maurice C. Hall 42 

A Peculiar Morphologic Development of an Egg of the 
Genus Tropidocerca and its Probable Significance. 
Winthrop D. Foster 45 

The Action of Arsenical Dips in Preventing Tick Infesta- 
tion. H. W. Graybill 48 

Eorhynchus: A Proposed New Name for Neorhynchus 
Ham ANN Preoccupied. H. J. Van Cleave 50 

The Helminthologtcal Society of Washington, Proceedings 52 
Notes 54 



The list of foreign collaborators is imperfect owing to present con- 
ditions in the mail service and its publication is deferred until a later 
number.