96 THE MICROSCOPE 



Fig. 5. — Fixed young of Comatula rosacea (after Forbes). 



,, 6. — Comatula rosacea, free adult. 



,, 7. — Young stages of Holothuria tubulosa, one of the Sea-cucum- 

 bers. 



8. — PiUdium, the " pseudembryo " of a Nemertid. a, Aliment- 

 ary canal ; b, Rudiments of the Nemertid. 



9. — Cysticercus longicoUis, or Bladder-worm. 



,, 10. — Head of adult, Tcenia solium enlarged, showing the hooklets 

 and cephalic suckers. 



,, 11. — Portion of a Tape-worm (Strohila), showing the alternate 

 arrangement of generative pores. 



,,'12. — Adult Ascidian, Sea-Squirt, Molgula socialis (after Lacaze 

 Duthiers). 



,, 13. — Tadpole of Ascidian, showing— a, Notochord ; h, Spinal cord; 

 c, Brain ; d, Mouth ; e, Gills. 



5> 



5) 



Zbc niMcro6cope anb bow to use it. 



By V. A. Latham, Late Hon. Sec. U.J.F.C, Norwich. 

 Part IL — On Mounting Microscopic Objects. 



FUNGI. — If good mounts of the spores of fungus — such as, 

 for example, the P^iccijiia — are wanted, the spot should be 

 removed from the leaf by means of a very sharp-pointed 

 scalpel, and then, the slip being breathed upon, the fungus will 

 adhere to the glass ; but in some few cases, as in Xenodochus, the 

 spores are so dense that it is not well to add Dammar imme- 

 diately ; but in such a case, a drop of Benzole, placed by means 

 of a piece of rolled paper or a match by the side of the spores, 

 wall quickly penetrate them. When this has nearly evaporated, a 

 drop of Dammar may be put direct upon the spores, after which 

 the cover-glass should not be placed upon it for half-an-hour, and 

 it will be found that, when warmed and put down, it will not move 

 the objects so easily as it would have done if this plan were not 

 followed. A short list of the Puccinias may be of use. 



Pucciiiia gramiiiis (Wheat Mildew), common on grasses and 

 straw in the autumn, forming long, blackish lines. The spores are 

 two-celled, borne on a slender, colourless stalk, and accumulated 



