THE LINNEAN HERBARIUM 29 



We learn froin the Introduction that a popular " account of 

 British Lichens" is in course of preparation by the compiler: 

 as Mr. Horwood adds to his systematic knowledge the experience 

 of an enthusiastic field-botanist, it may fairly be presumed that 

 this book will be of much practical use to beginners, and thus 

 supply an existing want. H p Reader# 



The Linnean Herbarium. 



Dr. Daydon Jackson, to whose laborious compilations in 

 various directions of bibliography botanists are so greatly in- 

 debted, has added one more to his claims on their gratitude in the 

 Index to the Linnean Herbarium which forms a Supplement to 

 the Proceedings of the Society for the Session of 1911-12. The 

 title chosen is very modest, for the Index contains not only an 

 enumeration of the plants in the Herbarium " with indication of 

 the types of species marked by Carl von Linne," but an explana- 

 tion of the signs employed in connection with the specimens and 

 a list of the contributors, with notes as to their share in the 

 collection. These signs, some of which will have attracted the 

 notice of those who have consulted the Herbarium, have been 

 variously explained ; it was left for Dr. Jackson to copy them each 

 time they occurred, with the name of the plant to which they 

 were attached, and on the information thus brought together to 

 base conclusions which are not likely to be disputed, and thus to 

 clear up a point which, not itself of special importance, is at any 

 rate of interest, as everything connected with Linnaeus must be. 

 In like manner the system of numbering adopted by Linnaeus is 

 explained. 



Each of the three earlier enumerations of the contents of the 

 Herbarium, Dr. Jackson tells us, is faulty, although that indicated 

 in the copy of the first edition of the Species which is in the 

 National Herbarium was made by the usually accurate Dryander. 

 Foreign botanists, as well as those living in this country, will 

 thank the compiler for enabling them to ascertain readily of which 

 of Linnaeus's species they can see authentic specimens. They 

 will, however, do well to bear in mind that the specimens in 

 the Herbarium cannot always be accepted as typical for the 

 Species of 1753, as additions were made from time to time by 

 various collectors. During the investigations " more than one 

 hundred specimens which had been transferred by Smith to 

 other genera have been replaced, so that the Linnean material is 

 again brought together." In a useful bibliography Dr. Jackson 

 gives the authorities on which his statements are based. 



We should have been glad if it had been thought desirable to 

 reprint with the Index the very interesting account of the acqui- 

 sition of the Linnean Collections which Dr. Jackson prepared for 

 the Centenary Anniversary of the Society and published in 

 the Proceedings for 1887-8, pp. 18-29. A slight addition to this 

 account may be made. Dr. Jackson (p. 26, footnote) quotes from 

 Smith's correspondence the remark that he nearly lost the collec- 



