343 



lished by him in the * Penny Magazine ' for 1833. His figures of a 

 somewhat analogous subject, the apple-blight, and the insect pro- ' 

 ducing it, accompany Sir Joseph Banks's memoir on the introduc- 

 tion of that disease into England, in the second volume of the ' 

 Transactions of the Horticultural Society. 



Mr. Bauer had commenced, before the close of the last century, 

 a series of drawings of Orchideae, and of the details of their re- 

 markable structure, to which he made additions from time to time, 

 as opportunities offered, nearly to the termination of his life. A 

 selection from these, which form one of the most beautiful and ex- 

 tensive series of his botanical drawings, was lithographed and pub- 

 lished by Professor Lindley, between the years 1830 and 1838, under 

 the title of " Illustrations of Orchidaceous Plants." 



A paper by Mr. Bauer, entitled " Some Experiments on the 

 Fungi which constitute the colouring matter of the Red Snow dis- 

 covered in Baffin's Bay," was published in the Philosophical Trans- 

 actions for 1820. By mixing the snow containing these fungi with 

 water, he found that they could be made to vegetate, but that they 

 produced new fungi of a green instead of a red colour. By ex- 

 posure to excessive cold the primitive fungi are killed, but their 

 seed still retains vitality, and, if immersed in snow, which appears 

 to be their native soil, they reproduce new fungi, which are gene- 

 rally of a red colour. 



The Philosophical Transactions for 1823 contains the paper by 

 Mr. Bauer already alluded to, entitled " Microscopical Observations 

 on the Suspension of the Muscular Motions of the Vibrio tritici" 

 which forms the Croonian Lecture for that year. This minute 

 worm, which infests wheat, and is the immediate cause of that de- 

 structive disease called the Ear Cockle or Purples, congregates in 

 immense numbers in the substance of the grains thus diseased, 

 forming masses of a white and apparently glairy mucus, which, 

 when immersed in water, separate and exhibit, under the micro- 

 scope, the worms in lively motion. After they have become per- 

 fectly dry, and apparently lifeless, they may be readily revived by 

 being moistened with a drop of water, when they become as lively 

 as before. Mr. Bauer determined, by a series of experiments, that 

 the ova of these worms are conveyed into the cavities of the ger- 

 mens by the circulating sap. On inserting some of the worms into 

 sound grains of wheat, and allowing them to germinate, he found 

 the worms, in different stages of their growth, in the stalk, and ulti- 

 mately in the germens of the new plant. 



In the year 1816 he commenced lending the assistance of his 

 pencil to Sir Everard Home, in the various anatomical and physio- 

 logical investigations in which the latter was engaged ; and in the 

 course of ten or twelve years furnished, in illustration of Sir Eve- 

 rard's numerous papers in the Philosophical Transactions, more 

 than a hundred and twenty plates, which were afterwards reprinted 

 in his ' Lectures on Comparative Anatomy.' These plates, which 

 form together the most extensive series of Mr. Bauer's published 

 works, embraced a great variety of important subjects, chiefly in 



