T. 15. ROSSETtR ON CYSTICERCUS QUADEICURVATUS. 341 



elucidate its possible coiiDection with the hooks and the radial 

 muscles of the rostrum. 



Such delicate objects as these which have been treated in 

 media under a cover glass, and whose length in this instance 

 was 187 //, and 125 fx broad, require careful ma-nipulation in 

 exploring them; teasing such a minute particle, or rather 

 portion, of tissue with needles is entirely out of the question, 

 and raising the cover-glass meant one of two things, either 

 floating away of the object or disintegration of the sjDecimen . 

 Accordingly the glycerine was withdrawn, and then water 

 acidulated with acetic acid allowed to flow" gently under the 

 cover-glass, suflicient pressure being applied to keep the 

 ruptured cyst and tissue from floating out. This added fluid 

 was also drawn off and a thin film of acidulated glycerine 

 allowed to run in and take its place. Suflicient time having 

 been allowed for the acid medium to permeate the substance 

 pressure was again employed. The hooks which hitherto had 

 resisted the separation now expanded in an upward direction, 

 being driven on either side by pressure upon the cover-glass 

 the points of the posterior root bending together, then suddenly 

 separating from each other, finally dropping into a vertical 

 position, but remaining contiguous to each other, back to back, 

 as if the substance Avhich had hitherto held them was stretched 

 out of its normal length, or had been loosened.- Pressure was 

 still kept on the cover-glass, and the superfluous glycerine being 

 removed, a film of carbolized gelatine run round edge of cover- 

 glass ; when this was dry a coating of Bell's cement was 

 applied to keep the cover-glass from springing. 



Simple as this process may seem, the object in view was 

 attained, for, with the aid of a ^^-g- immersion, the hitherto 

 obscure and abruptly- terminating fibrous tissue was traced 

 further on, finally spreading itself like a fan (Fig. 46). In its 

 normal condition it would have run upwards over the convex 

 face of the rostrum, uniting itself with the radial muscles at 

 their point of attachment to the hooks. From the position of 

 the hooks on the embryonic scolex within the cyst it is possible 

 by analogy to sketch out or delineate the mature scolex. In 

 this instance I should be inclined to hold the opinion that the 

 scolex when discovered in its final host will be of an elongated 

 form with a narrow attenuated neck ; that the suckers would 



