278 IIFNRY C.MCCOOK, 



l)y partitions, which have been cut very thin, in many spots beinjr just 

 broken throuj>h. At one spot, PI. II, Fig. 2, b, a section of one of 

 these halls is entirely enclosed, forming a triangular chamber one and 

 one-fourth inch in height, and one and one-half inch at the base 

 It looks, in the specimen, somewhat like a bay window ptojecting over 

 the walk. The roof of this chamber served as the floor of the r(i(jm 

 above, and its floor is evidently the ceiling of the large hall whose 

 floor (IM. TI, Fig. 2, c,) appears below. The wall of this chamber was 

 worn quite thin, making a small window like opening, (d,) through 

 which by means of a probe it was readily ascertained that the room 

 is hollow. The entrance is from the rear and side at e. The great- 

 est amount of excavation is found in this block from which the draw- 

 ings are made. It is twelve inches in height, and composes the lower 

 part of the formicary. 



The series of galleries thus described is terminated or surmounted by 

 an irregular dome (PI. II, Fig. 3,) which, with its pendant columns, 

 presents a striking resemblance to the roof of a limestone cavern 

 with its drooping stalactites. This is in fact the ceiling of the main 

 formicary. It may be considered the tirst of a new series of works 

 whose outlines are represented at PI. Ill, Figs. 2 and 3. The archi- 

 tecture of this second series whose characteristic is the dome or 

 vault, is quite distinct from that of the first, the characteristic of 

 which is the system of galleries and halls. The first series may be 

 termed ColumiKir, the second Cavernous. The dome of PI. II, Fig. 3, 

 rises to the height of one and one-half inches. Above it, and com- 

 municating by at least two tubular "stairs" or ascents, is an irregular 

 vault or series of vaults varying from three fourths of an inch to three 

 inches in height, (PI. Ill, Fig. 2.) The floors, walls and roofs of these 

 cavities are tolerably smooth, and are blackish as though stained with 

 formic acid. One of these vaults [a,] is somewhat separate from the 

 central system, the connection being by a circuitous gallery [b,] five 

 inches long. The floor of this vault (PI. lit, Fig. 3,) is of irregular 

 form; the surface is uneven, as is common with the floor of the gal- 

 leries and halls, but is cut and gouged iu .several spots as though with 

 a knife. It is free from the stains which mark the rest of the series. 

 The roof (Fig. 2, a,) is diamond-shaped, and at two angles (x and y,) 

 has communication upward and laterally for several inches, as deter- 

 mined by probing, with galleries and wide halls, ^'aults similar to 

 those described above are excavated in the main formicary, forming 

 the lower part thereof, only reduced in size. The outlines of these 

 vaults are represented in the figure. 



