148 BIBLIOGRAPHY. 



regulate the Electro-Magnetic Force." This last portion of the 

 paper more particularly referred to the action of electric currents in 

 the production of cell-walls and cells which, becoming polarized, 

 would elongate or become crescentic, and by an extension of their 

 lines of force would even form tubes, as in nerve-tissue. The rotation 

 of the frog-embryo within the egg was considered due to dextrorsal 

 currents. The source of this electricity was referred to a magnetic 

 condition of the arterial blood from its absorption of oxygen ; and ex- 

 periments as to the magnetism of arterial and venous bloods were 

 cited in support of this idea. The bi-concave form of the blood 

 corpuscles, their adherence by their flattened surfaces, the connection 

 of osmosis with electricity, and finally Dr. W. B. Richardson's experi- 

 ments as to the conducting power of blood, were held to establish the 

 theory. 



Captain Lang exhibited the eggs of a parasite (order Anopleura, 

 genus Docophorus) foimd in vast numbers on the down of a kestrel 

 hawk lately dead. Examination after death showed that almost all 

 the down feathers had been eaten away, whilst on the few remaining 

 feathers these eggs were most abundant. They were mere empty 

 shells, yet but one dead parasite and no living ones could be seen. It 

 was presumed that the death of the bird (otherwise apparently 

 healthy) resulted from exposure to cold in consequence of the loss of 

 its downy covering. 



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Botanische Abhandlungen aus dem Gebiet der Morphologic und 

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 Marcus. 



Untersuchungen iiber Bau und Entwickelung der Arthropoden. 

 Von Ant. Dohrn. 2nd Heft mit 8 taf. Leipzig. Engelmann. 



Biologische Studien. Studien iiber Moneren und andere Protisten 

 nebst einer Eede iiber Entwickelungsgang und Aufgabe der Zoologie. 

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Beitrage zur vergleichenden Neurologic der Wirbelthiere. Von 

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Grundziige einer Spongien-Fauna des Atlantischen Gebietes. Oscar 

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Beitrage zur Anatomie und Physiologie. V. Band. 2nd Heft. 

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Physiologisch-anatomische Untersuchungen, iiber den Uterus. 

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Histologic generale. fitude critique sur Virchow et la Pathologie 

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Beitrage zur Histologie des Gehororganes. C. Rudinger. Munchen, 



