104 D. A. RHINEHART 



Fig. 7 A graph, made according to the method devised by Prof. A. G. Pohl- 

 man, showing the connections of the nervus petrosus superficialis major and the 

 ganglion sphenopalatinum. A graph of this sort is made by selecting that part 

 of a series which is to be used, and marking out on one edge of a piece of milli- 

 meter plotting paper a set of stair steps for each row of sections on the slides, 

 representing each section by a single step. Nerves or other structures are repre- 

 sented in the graph by broken or solid lines, dots, etc., and as these structures con- 

 tinue through the series the lines or dots are continued on the paper, passing 

 through a millimeter for each section. By continuing this and representing 

 changes in position, branchings, anastomoses, etc., by changes in the lines, al- 

 most any structure which passes for some distance through a series can be graph- 

 ically shown. 



The graph shown as figure 7 represents certain nerves and ganglia and their 

 connections in slides 16 to 24 of a trapsverse series of one half of a mouse head. 

 The numbers on the left of the graph are the numbers of the slides and the rows 

 on each slide. Each section is represented by a single step in the stairs. As an 

 illustration, the ganglion geniculi is present in section 1, row 1, slide 16, and is 

 shown at the lower right part of the graph. The ganglion ends and the nervus 

 petrosus superficialis major begins in the last section in that row. This nerve 

 continues through the second into the third row where it bends medially, this 

 being shown by a bend in the line representing the nerve. In section 8, row 1, 

 slide 17, and in section 2 of the second row the nervus petrosus profundus joins the 

 nervus petrosus superficialis major to form the nervus canalis pterygoidei. The 

 nervus canalis pterygoidei continues through the series until row 3, slide 21, is 

 reached where the ganglion sphenopalatinum begins, the ganglion being repre- 

 sented by an unshaded area continuing the course of the nerve. 



Bundles of sympathetic fibers and branches of the ganglion sphenopalatinum 

 are represented by broken lines, cranial nerves and their branches by solid lines, 

 and ganglia by unshaded areas along or within the nerves. Figures 4, 5, and 6 

 welre drawn from sections of the same series used in making the graph, the loca- 

 tion of these sections is indicated by the broken transverse lines. The small 

 letters along the lines indicate bundles of nerves which are shown and similarly 

 labeled in the figures. 



Fig. 8 A graph showing the distribution of the posterior and middle palatine 

 nerves and a part of the anterior palatine nerve to one half of the soft palate 

 and the posterior part of the hard palate, made from the same slides which were 

 used in making the graph shown as figure 7. The small circles indicate the ap- 

 proximate locations of the taste-buds and the broken line the limits of the pala- 

 tal glands. The arabic numerals indicate branches of the nerves which are shown 

 under the mucosa of the palate in figures 4 and 5. The broken transverse line 

 marked x indicates the place of junction of the hard and the soft palate. For 

 further explanation see the text. * 



