78 American Quarterly Microscopical Journal. 



at a later period than the red. They reject the doctrine that the heart 

 and vessels are formed before the blood, but they appear contempora- 

 neously. To be continued in the next number. 



Microscopy at the Universal Exposition of Paris. — Dr. 

 Pelletan. 



Note on the Application of Ammonium Picrocarminate to 

 the Anatomical Study of Intestinal Worms. — Dr. G. Duchamp. 

 — Owing to the difficulty in making out the structure of these worms 

 after death, which produces almost immediate alteration, this coloring 

 solution was tried with apparently perfect success, and the preparations 

 can be preserved. The worm is merely placed, while living, in the 

 ordinary picrocarminate for about thirty minutes. 



Cryptogamic Botany. — Continued. 



On the Gum Disease of Citron Trees, {^Fusisporium linwni, 

 Briosi). — C. Briosi. — This is only an introduction to what promises to 

 be an interesting account of the author's investigations. A review of 

 the history of the disease is given, and the questions he proposed to 

 solve in beginning the work himself. 



Researches on the Comparative Anatomy and the Develop- 

 ment of Tissues in the Stem of Monocotyledons. — E. Dubreuil. 

 — This is a review of a thesis by Dr. A. Guillaud, and it is of such a 

 nature that we must give it some space here. 



The thesis is divided into two parts. The first is purely anatomical. 

 Plants are divided into six distinct types, and by further study this 

 number may be increased. Each of these types shows some peculiarity 

 of organization and they do not pass gradually into each other. 



Type I. This is characterized by the absence of special tissues ; the 

 fundamental cortical tissue passes without the least modification into 

 the medullary parenchyma. Example, Polygonatiini vulgare. 



Type II. This type is distinguished by the presence of a more or less 

 complex band of special tissues, developed about the external ring of 

 bundles. This band constitutes an intermediate zone between the pith 

 and bark, isolating the parenchyma of the two regions. Examples, Iris 

 flore7itina, L., Chamoedorea elatior. Mart. Acorns calamus, L., Scirpus 

 lactistrts, L. These examples constitute different sub-types which may 

 be distinguished. 



Type III. In this type the rhizomes are long and slender. The bun- 

 dles, less numerous than usual, do not describe a central curvature, are 

 not decussate, and are ranged in a circle or in a definite ring as in 

 ordinary Dicotyledons. Example, Luzida campestris, D. C. 



Type IV. This, like the last, is founded on the arrangement of the 

 bundles, which form two groups isolated in the inter-nodes and only re- 

 uniting as they enter the leaves ; the one includes those in which the 

 bundles, curved towards the centre, occupy the interior of the pith ; the 

 other, those with straight bundles which form the ordinary circle and 

 the limit of the bark. Example, Tradescatitia. 



