PHYSIOLOGY OF LAMELLIBRANCH BLOOD-CORPUSCLES. 605 
Some Points in the Physiology of Lamellibranch 
Blood-Corpuscles. 
By 
G. H. Drew, B.A.Cantab 
With Plate 31. 
Table op Contents. 
PAGE 
Introduction ...... 605 
Historical ...... 606 
Methods — 
Collection and Preservation of Living Animals . . 608 
Collection of Blood ..... 608 
Fixing and Staining Methods .... 609 
Methods of Observing the Process of Agglutination of the 
Corpuscles . . . . .610 
Methods of Studying Phagocytosis . . .611 
Description of the Blood ..... 612 
The Process of Agglutination and its Relation to the Healing of 
Woimds ...... 614 
Phagocytosis ...... 618 
Bibliography . . . . . 620 
Explanation of Plate .621 
Introduction, 
The investigations described in this paper were carried out 
on the blood of Cardiuin norvegicum. This animal was 
chosen as a type as it presents several features which render 
it especially suitable for haematological work. Among these 
may be mentioned the ease with which the blood can be 
obtained in large quantities, the relatively large size of the 
