



I 



1917] FORSAITH—ALLOCTHONOUS PEAT 207 



EXPLANATION OF PLATES X AND XI 



PLATE X 



Fig. i. — Composition of allocthonous peat from Lake Harris in Florida; 

 grayish background represents amorphous mass of organic derivation in which 

 there are imbedded abietineous pollen grains, appearing as oblong bodies with 

 2 laterally attached air sacs; an idioblast from a water lily is pictured in 

 lower left hand corner as a series of spinelike appendages radiating from a 

 common center; other inclusions are dense black ejecta from amphibious 

 animals, and spindle-shaped fresh water sponge spicules. 



Fig. 2. — Sample of similar constituents from Lake Dot. 



Fig. 3. — Material from Lake Eustis in which there are idioblasts, pollen, 

 spores, spicules, ejecta, and structureless matter; in upper left hand corner 

 there appear 3 specimens of the amoeboid Arcella; diatoms of Stauronesis and 

 Navicula type occur in upper and lower portions of figure respectively. 



Fig. 4. — Magnified view of peat from Lake Orange 1 mile off shore; besides 

 characteristic structures, strips of epidermis and an herbaceous plant fragment 

 appear, cells of which are still intact. 



Fig. 5. — Organization of Kentucky cannel coal, X250; scattered through- 

 out the section are numerous light bodies, flattened spores of vascular crypto- 

 gams (homologues of the spores and pollen shown in the illustrations of 

 allocthonous peat) ; the long grayish bands are indicative of metamorphosed 

 bits of wood ; separating spores and lignitoid fragments are dense black masses 

 of organic matter. 



Fig. 6. — An herbaceous peat from Lake Orange near shore; fragments of 

 roots, etc., manifest cell structure clearly; evidences of drifted material are 

 present, as an idioblast and the mouth part of some insect. 



PLATE XI 



Fig. 7. — Sample of "saw grass" (Cladium) peat 3 ft. from bottom of a 

 marsh bordering Lake Harris; exemplifies the usual inclusions characteristic of 

 allocthonous peat. 



Fig. 8. — Preparation of peat 3 ft. from bottom of a bog near Leesburg, 

 Florida, in which are pollen, spores, spicules, ejecta, and other allocthonous 

 inclusions; also woody and herbaceous fragments of plants, cells of which i 

 still intact. 



Fig. 9. — Nature of peat above the deep brown plastic layer illustrated 

 in fig. 8; in addition to usual sedimentary matter, intact fragments of her- 

 baceous plants may be seen. 



Fig. 10. — Another sample from the same horizontal plane with a much 

 distorted plant fragment in upper right hand corner; below and to left of this, 



sponge 



Fig. 11. 



Jacksonvill 



almost entirely composed of lignitoid plant fragments 



