14 stages in development. With the vertebrates will be exhibited skeletons and preparations showing the circulatory and nervous systems, with skulls prepared so as to show the dentition. The chief variations in the characters of nests and eggs will be shown with the birds. One adjunct of very considerable educational importance will be furnished in the set of " Handbooks " which will be issued one by one as the several sections of the Museum are put into order ; they are intended to afford such information as will enable the visitor to understand the nature and teaching of each exhibit, and they will be sold at a cheap rate in the Museum itself. The gathering together of specimens and collections and appliance for their conservation has been vigorously carried on during the last few years, but an immense amount of work yet remains to be done. Above all things is required Systematic Collecting in various parts of the county. If more friends of the movement would take up definite groups, and endeavour to obtain all the species in those groups occurring in their districts, they would find the occupation a delightful and instructive one, and the results would be valuable not only to our Museums, but also in improving our County records, which are still so incomplete in many sections. Gratifying aid could also be afforded by those having the means of obtaining isolated species, specimens of which are still unrepresented in our collections. We may particularly mention many Birds (coast species especially), and authenticated Eggs and Nests ; some species of Mammals, particularly the Bank Vole, the Shrews, Dormouse, and Harvest Mouse. Fishes from the Essex rivers, and the more uncommon marine species. Many kinds of Marine Mollusca and Crustacea. Some of our rarer Echinodermata, Polyzoa and Sponges, &c. Insects of many families are required, particularly Hemiptera, Orthoptera, and Hymenoptera. Authentic specimens of Flowering Plants from several parts of the county are also desired, as well as Leaf Fungi and Lichens. To carry out fully and usefully the plans indicated, there will necessarily be needed a large expenditure of time, energy, and money. The modern methods of preparing specimens and arranging museums are very interesting but exceedingly expen- sive. To give an instance—adequately to represent some of the