[59 ] 
Exchanges. 
** Cambridge Antiquarian Proceedings,” 1879 to date, cost price, 44s. 6d. ; 
also, occasional publications. Exchange for Text-books on the Microscope, 
Entomological or Botanical Books, or Standard Works on Higher Mathematics 
or Natural Philosophy.—G. H. Bryan, Thornlea, Chaucer Road, Cambridge. 
British Association Handbook of Manchester, with Natural History, etc., 
of district and Description of Excursions. Exchange for any back numbers of 
Journal of Microscopy except Nos. 6 and 17, or for offers in books or journals. 
—G. H. Bryan, Thornlea, Chaucer Road, Cambridge. 
A few mounts of Chalk Washings from Cambridgeshire for exchange.—G. 
H. Bryan. : 
Dracon F iirs.—Mr. W. Harcourt Bath, Ladywood, Birmingham, desires 
to correspond with students of the Odozadza in all parts of the globe, as he is 
specially working up this group of insects. Specimens for figuring in his 
forthcoming ‘‘ Monograph of British Dragon Flies” will be very acceptable. 
There is probably no class of insects so neglected as Dragon flies, and Mr. W. 
Harcourt Bath will be very pleased to assist anyone desirous of commencing 
their study. 
Wanted, Parasites, unmounted, prepared. Will give Slides (Anatomical, 
Pathological, Botanical, Micro-fungi, Parasites, Zoophytes, etc.) in exchange. 
Splendid Slide of Bacilli in section of Lung (acute miliary tuberculosus). 
Home and foreign correspondents wanted to exchange slides or micro material 
of above or other subjects. —Fred. Lee-Carter, Gosforth, Newcastle-on-Tyne. 
The following well-mounted and neatly finished Micro Slides for exchange: 
—Cystolitus of Cactus; Cuticle of Cactus, in C.B.; Cuticle of Azasassa 
sativa, showing large stomata, in C.B.; Scale of the Szdéak, a Russian fish ; 
Pollen of Salvia patens, in C.B.; Section of Dammar Wood, in C.B.; Skin 
of Sturgeon, with bony plates zz sztz. Approval to be mutual.—Rev. H. W. 
Lett, M.A., Aghaderg Glebe, Loughbrickland, Co. Down. 
Reviews. 
MARVELS OF EARTH, AIR, AND WATER. Crown 8vo, pp. 129. 
MARVELS OF THE ELEMENTS. Crown 8vo, pp. 182. 
MARVELS OF INVENTION AND SCIENTIFIC PUZZLES. Crown 
8vo, pp. 196. 
MarVELs or Heat, LIGHT, AND SOUND. Crown 8vo, pp. 196. 
(London: Ward and Lock.) Price Is. each. 
These are four little books, uniformly bound, of the ‘‘ Scientific Recrea- 
tion Series.” The first gives a popular account of the Forces of Nature, 
Gravity, the Barometer, Air-Pump, and other curious and interesting appara- 
tus; the second treats of the Metals, Bases, Salts, Alchemy, Distillation, 
Flame, and Acids; the third gives a popular account of many useful and 
interesting Inventions and Discoveries, treating of Chance, Magic Squares, 
Solitaire, the Gyroscope, Scientific Objects for the Household, Useful Inven- 
tions, New Locomotive Appliances, and many other things ; whilst the fourth 
describes in a popular manner Heat in its various manifestations, the Thermo- 
