26 JOURNAL OF MARINE ZOOLOGY AND MICROSCOPY. 



The ova adhere to the vegetation on the side of the aquarium 

 and show little motion for 2 or 3 days. They are very easily removed 

 with a glass tube, and may be returned to the aquarium after micro- 

 scopic inspection without any deterioration. The development may 

 be watched under the microscope from the first day up to maturity. 



For isolating the ova nothing is better than thin wine-glasses 

 narrowing to the bottom, broken at the stem. These float readily 

 in the Aquarium, and the small quantity of water they contain 

 (| to 1-oz.) remains perfectly good. In fact each becomes a miniature 

 aquarium, the temperature of course being that of the larger 

 aquarium in which they float. 



For preserving the Aster ince as permanent objects and at any 

 stage of their development, the best method is to use Cocaine 

 Hydrochlorate and to allow them to come under its influence very 

 gradually. In this way they die without undergoing any distortion, 

 and may be transferred to weak Alcohol of 30 or 35 °/ o , and preserved 

 in this fluid, or carried through higher percentages of Alcohol to oil 

 of Cloves, this removed with redistilled Turpentine and then mounted 

 in Canada Balsam. 



A Handbook to the Copepoda. — We have before us " A Revision of the 

 Copepoda of L'pool Bay," by Mr. I. C. Thompson, F.L.S., and find much to praise 

 therein. It is indeed a happy idea to give small outline sketches of each animal 

 dealt with, and to group those of related species on the same page, as is here done. 

 Considered as a ready reference guide, it will be found extremely useful to all, 

 and especially to the junior, students of this order. This paper appears in Vol. VII 

 of the Trans. L'pool Biol. Soc, and we take this opportunity of suggesting to the 

 Committee the desirability of adopting the plan pursued by the Royal Dublin 

 Society, to wit, the selling of its more important essays separate from the 

 rnain volume at a correspondingly lower price. The major publications of the 

 Society would in this manner become much more widely known. 



A New Biological Text-book.— Mr. H. G. Wells is to be heartily com- 

 plimented on the completion of his useful Text-book of Biology (London : W. B. 

 Clive, 1893). Part II, devoted to invertebrates and plants, is now before us, and in 

 every way is a worthy successor to Part I (vertebrates), now so greatly esteemed 

 in teaching circles. We feel sure Part II will quickly be received into equal favour, 

 and we heartily recommend it to all students of " types." 



The mode of illustration marks the trial of a novel experiment. Many folding 

 plates are provided, and in order to prevent scamping of the practical work of 

 dissection at first hand, the figures are of such a nature, that in most cases it is 

 difficult for the tyro to gleam therefrom proper enlightenment of the text, except 

 he be concurrently making the equivalent dissection, in which case the diagram 

 will give him clearly the necessary information regarding the identification of parts. 

 Such an arrangement spoils the artistic value of the work, but we appreciate the 

 motive and believe the plan will answer admirably the purpose intended. The happy 

 mean is struck 'twixt Huxley's too drastic " no illustration " and the over elaborate 

 drawings of others, that by their completeness, delusively tempt the student to 

 avoid the drudgery of dissection. 



