BIBLIOGRAPHICAL NOTICES. 185 



Gryllotalpa vulgaris, both ends are convex ; the internal, however, much 

 more so than the outer. In Locusta viridissima both are very slightly 

 convex. In Mantis religiosa almost even. In Vespa crabro, Apis melli- 

 fica and Bombus, convex, the inner most so. In ^Eschna grandis, Agrion 

 virgo, Libellula depressa, slightly convex, the inner being much so. In 

 Cicada orni, slightly convex, the inner strongly so. In Cossus Ligni- 

 perda, Sphinx Atropos, Pontia Brassier, Vanessa Urticte, Musca domestica, 

 and Tabanus bovinus, slightly convex, the outer appearing more so. In 

 Apis mellifica and Vanessa Urticee, between the facets are observed 

 simple hairs, which extend to the inner surface of the cornea, and are 

 placed irregularly. In Vespa crabro, on the inner surface of the cornea, 

 at the border of the facets, are formed short, rounded striae, probably 

 indentations. The number of facets in each eye are in Galathea strigosa 

 5400; mMelolontha vulgaris 6300 ; in M.fullo 9400; in Calosoma 

 sycophanta 4030 ; in Locusta viridissima 2000 ; in Bombus 4000 ; in 

 jEschna, grandis 10,000; in Cicada orni 11,600; in Cossus ligniperda 

 8 ICO; in Sphinx Atropos 12,400; in Vanessa Urtic<e45QO; in Musca 

 domestica 4900, &c., &c. (To be continued, as soon as the next Part 

 comes to hand.} 



New form of vessels in Plants. Under the name of Dichotomous 

 vessels are described by Calamai (Annales des Sciences Natur., Vol. 

 XIV, p. 317) certain constantly forked vessels in plants, which are pro- 

 bably identical with the so-called Latex vessels. p. 75. 



33 tblta graphical 



Illustrations of Arts and Manufactures. By Arthur Aikin, F.L.S., 

 F.G.S., &c., late Secretary to the Society of Arts, London. J. Van 

 Voorst, 1840. 12mo, pp. 372. 



THE materials this interesting little work contains, have been selected 

 from a series of papers read before the Society for the Encouragement of 

 Arts, Manufactures, and Commerce in London, by the much esteemed 

 and respected Secretary, Mr. Arthur Aikin, who for twenty-four years 

 held that office, and communicated many important papers, from which 

 the work under notice has been written. 



The subjects treated of are : 1, Pottery; 2, On Limestone and Cal- 

 careous Cements. 3, On Gypsum and its Uses. 4, On Furs and the 

 Fur Trade. 5, On Felting and Hat-making. 6, On Bone. 7, On 

 Horn, Tortoiseshell, and Whalebone. 8, The Antiquarian History of 

 Iron. 9, The Metallurgical History of Iron. 10, On Engraving and 

 Etching. 11, On Paper. 



Of this list, there is one article which is interesting to the Microsco- 

 pic observer, viz. the chapter on Felting. The various hairs used for 

 this purpose are neatly figured from drawings made by Mr. Cornelius 

 Varley. The micrometric measurements are added to the interesting 

 matter which accompanies each figure, and adds very much to the ge- 

 neral value of the work. 



